SK85593A3 - Brake shoe - Google Patents

Abstract

A brake shoe has a lining carrying plate (1), a friction lining (2) and a damping plate (3) secured to the side of the lining carrying plate (1) opposite to the friction lining (2) so as not to turn nor move. The lining carrying plate (2) and the damping plate (3) are provided with mutually aligned and adapted through recesses (5, 6, 7, 8). The recesses (7, 8) of the damping plate (3) have projections that extend over at least part of the circumference of the recesses, that project toward the lining carrying plate (1) and that engage the corresponding recesses (5, 6) of the lining carrying plate (1) with a fit that allows the damping plate (3) a limited freedom of movement.

Description

Known brake shoes consist of a support plate supporting the friction lining and a damping plate arranged on the side of the support plate facing away from the friction lining and fixed and secured against displacement or twisting.

Such a brake shoe is known from DE-27 13 377 A, where a damping plate is glued between protruding

the edge portions of the support plate, whereby a mechanical connection of the friction lining support plate and the damping plate is achieved. A known cushioning tin pad is ^; gripped between the marginal portions with prestressing, if it exhibits impaired damping.

and

i.

DE-34 25 406 A discloses a disc brake shoe in which a damping plate is attached to the outer periphery of the friction lining support plate by means of thin metal parts projecting perpendicularly from the edge.

EP-0 373 333 A2 is a known brake shoe having a damping plate which is arranged between a resilient spring and a friction lining support plate, the damping plate being fixed and secured to the friction plate in the event of a fall. damping against displacement and twisting. In this, the tin washer held mechanically and with a shape fit on the carrier plate. Damping sheet metal recesses of the carrier plate. The cup protrusions have conical walls that are subject to severe wear when the edges are rotated at>

recesses and carrier plates. A further disadvantage of this solution is that the friction lining also comes into contact with the damping plate when the damping plate is glued to the friction lining, thereby causing undesirable twisting of the damping plate bearing plate of the friction lining.

Accordingly, it is an object of the present invention that the ability to form the damping brake shoe is optimal, while at the same time ensuring that the damping plate is well secured in the desired position.

SUMMARY OF THE INVENTION

This object is solved by a brake shoe comprising a friction lining support plate, a friction lining plate and a metal backing plate arranged on the side of the supporting plate facing away from the friction lining and shear-proof according to the invention, which is characterized in that the friction plate supporting plate and the friction plate the flooring is provided with passageways adapted to the mutually matching recesses and the recesses of the damping plate are provided with a plate extending towards the support and extending at least partially with protrusions of the friction lining of said recess, the protrusions extending into corresponding recesses of the friction support plate with a bearing allowing limited movement of the damping plate.

The damping sheet that adheres to the adhesive backing plate of the friction lining under the adhesive coating is correctly positioned by at least two mutually matched recesses in the backing plate and the damping sheet under the reinforced edge edges of the recesses of the recesses provided in the damping sheet and engaging the recess . Due to i

the fact that the damping plate is also provided with recesses, wherein the friction lining is pressed into the support plate on the side facing the damping plate, this friction lining cannot exert pressure on the damping plate to twist it. thereby dampening the damping properties of the damping plate.

The mobility of the friction pad in the recesses of the friction lining support plate can be determined within narrow predetermined limits, and the movement tolerance of the damping plate can be determined individually for different types of brake shoes.

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The recess in the friction lining support plate is preferably designed as stepped, this recess extending towards the damping plate. The offset shape of the recess opening provides the advantage that even though the excess volume of the friction material passes through the recess, it does not come into contact with the thickened edges or projections of the damping plate, so that the friction lining material is reliably prevented.

The projections of the recess of the damping plate may surround the entire circumference of the recess, thereby forming a thickened edge forming a stop for the movement of the damping plate in any direction.

Preferably, the protrusions protrude from the damping plate in a perpendicular direction. The protrusions may then extend into the recess with a predetermined fit, i.e. with a predetermined clearance, without the risk of wear on the edges of the recess opening.

The opening of the recess of the friction lining support plate may be

Even on the side of the damping plate was beveled.

According to a further preferred embodiment of claim 13, which is a brake shoe for a disc brake, comprising a friction lining support plate symmetrical to the disc brake plane parallel and orthogonal to the rotational axis of the disc brake, and a friction lining and a damping plate, arranged on the side of the support plate facing away from the friction lining and secured against sliding, the friction lining support plate and the damping plate are provided with passage recesses flush with each other, wherein in plan view said recess or said damping plate recesses have at least two straight edges at the edge the opposing inclination to the radial axis lying in the axis of symmetry of the friction lining support plate and the straight edges have tongues extending towards the friction lining support plate and extending into corresponding recesses of the friction lining support plate with a bearing which allows limited clearance of movement of the damping plate in a direction parallel to the straight edges.

The solution according to the invention enables the precise fixing of the damping plate in its necessary position by means of mutually aligned and arranged through recesses, without causing any twisting between the friction support plate

Because of the damping plate, there is only limited space for movement between the tabs projecting towards the support plate and extending into its recesses and these recesses. The damping plate is reliably protected from slipping on the carrier plate or from twisting, even when large shear and torsional forces occur in combination with braking vibrations.

The positional fixation of the damping plate is particularly advantageous when the brake shoe becomes very hot because

In this case too, the adhesive connecting the damping plate to the support plate softens, whereby the damping plate is carried loosely on the friction lining support plate so that it can be displaced. The preferred embodiment of the invention, as set forth in claims 1 and 13, allows for a positional fixation of the damping plate even when loosely arranged.

An essential advantage of the reinforced edge tongues

produced deep pulling is that not are prone to violated i e. and by it is wise preferred solutions are selected i a in carrier Circular friction plate. Such recesses in the carrier plate frecie ob 1 marry and is can be technically produced easier e. by 1 preferred solutions are recess tlmi ace j plechové j washers equipped with two parallel pr i amym i

edges. Such rectangular recesses can then be produced in a single manufacturing operation by a simple tool shaped similar to a gable roof.

Advantageously, the recesses of the damping plate support converge towards each other in a radial direction. With this geometrical arrangement of the recesses, the transmission of forces from the damping plate to the friction lining support plate under load is much more advantageous, with the optimum inclination angle depending on the type of brake and varying accordingly.

The cutting tool for forming a recess in the damping sheet according to the preferred embodiment of the invention, as set forth in claim 13, can advantageously be used to bend the tongues to their final position for the assembly operation. Therefore, it is not necessary to bend the tongues of any additional tool and therefore no additional manufacturing operation. There are no recesses in the damping plate which are necessary for its positional fixation

I created by shearing, lie by combined shearing and bending. No selections are required for selections made in this way.

n * ·· **

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which ^: FIG ^. Fig. 1 shows a brake shoe with a damping plate mounted on it, FIG. 2 shows a section along line II-II in FIG. 1, FIG. 3 shows a friction lining support plate, FIG. 4 shows a section along line IV-IV in FIG. 3, FIG. 5 shows a section through a part of the damping plate in the area of the recess, FIG. 6 shows an embodiment with conical recesses in the friction lining support plate, FIG. 7 shows another embodiment of a damping plate, FIG. 8 shows a damping plate with cut-out recesses for positional fixation, FIG. 9 shows a cutting tool, FIG. 10, cutting the contour of the damping plate with recesses which are simultaneously cut, attaching the damping plate to the friction lining support plate, positioning the tabs in the recess of the friction lining support plate, and further developing the friction plate support.

DETAILED DESCRIPTION OF THE INVENTION

The brake shoe shown in FIG. 1, consists of a support plate X on one side of which a friction sleeve is provided and on the other side facing away from the friction sleeve and

2, a damping plate 3 is provided. This damping plate 3 is preferably glued to the support plate 1.

Both the support plate X and the damping plate 3 of the embodiment of FIG.

1, are each provided with at least two circular recesses 5, and 6, 8, which are aligned with each other, the recess

7, 8 of the damping plate 3 are provided with protrusions? Extending towards the carrier plate 1 and extending into its recesses.

5, 6. The recesses 7, 8 of the damping plate 3 are arranged concentrically with the corresponding recesses 5 of the carrier plate 1.

In FIG. 2 shows an embodiment in which the support plate 1 is provided with a recess 6, the friction lining side part 2 of which has a smaller diameter than the part 10 of the friction lining.

In addition, the portion 12 of the recess 6 on the friction lining side 2 is made slightly conical so that the opening of the recess 6 tapers in this part 12 towards the damping plate 3. The projections 9 of the damping plate 3, which can the recesses 6, the outer diameters of the protrusions 9 being by a given value smaller than the inner diameter of the portion 10 / I of the recess 6 on the side of the damping plate 3, so that the damping plate 3, although in principle fixed in the recesses 5, 6 of the carrier plate 7, it also has the possibility of a biaxial movement limited by a predetermined clearance. In this way, the position of the damping plate 3 is fixed with sufficient precision and strength, yet the damping effect has not been reduced by the mechanical connection with the shape fit; With this embodiment, improved damping is provided.

In this context, it is also essential that, when the brake friction lining 2 is applied to the carrier plate 1, the friction lining 2 can pass through recesses 5, 6 in different ranges without coming into contact with the damping plate 3, resulted in deterioration of damping.

In FIG. 3 shows the friction lining support plate 1 with recesses 5, 6. It should be noted that circular recesses 5, 6, 7 and 8 are particularly suitable, the insertion of a damping plate 3 into these recesses 5, 6, 7, 8 in the recess. The carrier plate 1, which is provided with a predetermined fit, can also be used in other shapes of these recesses 5, 6, 7, 8.

The recesses 5, 6 in the carrier plate may be provided

I i

but the walls must be perpendicular to the surface of the carrier plate

1 ..

According to another embodiment in which the recesses 5, 6 are not fitted, the walls of the recesses are provided

5, the conical extension extending towards the damping plate

3, so that there is also no contact of the friction lining with the pad 3 as its material passes through the damping recesses 5,

In the embodiment of FIG. 4 it can be seen that the recess portion 10 on the side of the damping plate 3 is bevelled at the edge to better prevent wear of the damping plate 3.

As shown in FIG. 5, protrusions 9 protrude from the damping

The sheet metal support 3 is preferably i

5, 6 on the side perpendicularly, so that even if the recesses are not beveled, wear is largely avoided.

It is also essential that the damping sheet metal damping sheet metal is that the projections 9 do not contact the washers 3 with the walls of the recess 5, 6, but are spaced apart therefrom, e.g.

0.2 to 0.1 mm.

There is sufficient distance for the projections of the sheet metal recesses

5, since large forces are provided, the washers 3 in the axial direction.

The recesses 5, 6 have an outer contour such that the bearing plates are mounted so that the projections 9 do not come into contact with the carrier even when the plate 1 is damped.

7, 8 may also have a polycarbonate at the same time serving as an anti-rotation device. In this case, one recess in the support plate 1 and one recess 7 in the damping plate 3 are entirely sufficient.

T

Fig. 7 shows a further embodiment of a damping plate with specially shaped recesses 7,

8. These recesses 7, 8 consist of a substantially circular cut out hole 14, but which is interrupted by tongues 16, which can be arranged at angular distances of

90 °, so that in the recesses 7, 8 the two tongues 16 each face one another. The tongues are angled at an angle

90 ° to the surface of the damping plate 3 and extending into the respective circular or polygonal recess 5 of the carrier plate

1. In the embodiment of FIG. 7 of the flat rectangular tabs 16.

consist

I projections 9

In FIG. 8 shows a damping plate 3 for a brake shoe consisting of a support plate 7 carrying a friction, the damping plate 3 being glued to the side of the support plate 7 facing away from the friction lining 22.

Both the support plate X and the washer 3 are each provided with two mutually matching recesses 5, 7,

6.

8, wherein the recesses 7, 8 of the damping plate 3 have protruding to the carrier plate in the form of protrusions adapted to the respective recesses.

5, 6, the tongues 16 extend into the annular recesses 5, 6 of the carrier plate f.

The recesses 7, 8 of the damping plate 3 are substantially rectangular, the shorter sides being provided with no tongues, while the longer sides of the rectangular recesses 7, 8 are provided with the aforementioned tongues 16 extending towards the support plate 1, these The tongues .16, seen from above in the plan view, form straight edges 15.

self inclined under the disc brakes radial axis 18 is

The recesses 7, 8 are preferably relative to each other at low angles to the radial axis 18.

belonging to the brake shoe, wherein t

coincident with the symmetry axis of the brake shoe;

In this way, the recesses 7, 8 are slightly radially outwardly facing outwardly.

The arrangement of the recess 7 in FIG. 8, i.e. with an inclination at two opposite angles <x, &lt; &apos; &gt;

18 is particularly suitable for advantageously fixing the damping plate 3 in the radial direction of the disc brake.

The angle α, β of the inclination to the radial axis is in the range of 0 ° to

5 ° and adjusts the brakes. The size shall be individually for the inclination angle θ, g of each vehicle and each type t

is selected according to the following parameters: friction lining size 2, stiffness, friction conditions and friction forces.

The tabs 16 of the recesses 7, 8 are movable relative to the recesses 5, 6 within a certain tolerance, so that the narrow lateral end faces 17 of the tabs 16 do not contact the recesses 5, 6 when no forces are applied, thereby dampening the damping plate. third

At ť load occurs in recesses 5, 6 point contact j azýčkov 16, so that there is an advantageous transfer of forces to the carrier plate 2 and is reliably prevented damping sheet metal damping washers 3 on the support plate 7.

In this way, the position of the damping plate 3 is fixed with sufficient accuracy and strength, and the mechanical connection with the shape adjustment is not impaired in any way.

As a result, vibration damping is improved.

As shown in FIG. 11, the friction lining 2 cannot come into contact with the tongues 16 when the damping plate 3 is glued in the recesses 5, 6 of the support plate 7, so that the damping of the damping plate 3 is not impaired by the friction lining 2.

FIG. 10 shows a manufacturing operation in which the damping plate 3 is produced by punching t

22, which determine the outer contour of the damping plate

3, and by cutting tools 20 that do not pierce but cut through the recesses 7, 8 of the damping plate 3. The composite cutting tool 20 with its cutting tip is shown in perspective in FIG. 9. This cutting tip has the shape of a gable roof, similar to the roof of a house standing upside down. The cutting tool 20 creates a double cross-section

T with the main cutting line in the middle between straight edges .15

1 and with two cutting lines perpendicular thereto, and formed by the front front edges of the cutting tool 20, the other cutting lines intersecting the short sides of the substantially rectangular recesses 7, 8 without forming the tabs 16.

Due to the special embodiment of the cutting tool 20, the two tabs 16 are simultaneously formed as a double T-shaped cut in one cutting operation and bent when the cutting tool 20 moves deeper, so that there are two manufacturing operations, punching and bending. replaced by a single cutting operation performed by a single cutting tool 20.

Upon withdrawal of the cutting tool 20, the tongues 16 swing out slightly due to elasticity, leaving the desired clearance between the tongues 16 and the walls of the recesses 5, 6 while maintaining the optimum position of the damping plate 3.

In the embodiment of FIG. 13, there is provided only one recess, which in this case is triangular, wherein the triangular shape may be either isosceles or equilateral, wherein the tongues 16 are provided with only two hinges of equal length, or the tongues 1.6 or straight edges 15 respectively in the case of an equilateral triangle modified to e

all its sides.

In the embodiment of the shape of an equilateral triangle with three tongues 16 extending into. The recesses 5, 6 may have an axis of symmetry extending between the tongues 16 forming a triangular k, the angle θ, the inclination relative to the radial axis 10, given by the arrangement of the recess 7, symmetrical to the radial axis.

1.8

In addition, the cushioned aca plate 3 can be provided with a rubber coating on one or both sides.

I improving the damping of vibrations transmitted by the brake piston.

Claims (15)

A brake shoe comprising a friction lining support plate, a friction lining and a damping plate arranged on the side of the support plate facing away from the friction lining and slip-proof, characterized in that: - the wear plate (1) of the friction lining (2) and the damping plate (3) are provided with through recesses (5, 6, 7, 7); 8), mutually mutually adapted and adapted and - the recesses (7, 8) of the damping plate (3) are provided with protrusions (9) extending towards the friction lining support plate (1) and extending into at least a part of said recess (7, 8), the protrusions (9) ) engage corresponding recesses (5, 6) of the wear plate (1) of the friction lining (2) with a bearing allowing limited movement of the damping plate (3). Brake shoe according to claim 1, characterized in that the recesses (5, 6) v Λ 7 the friction linings (2) are fitted with y from the bearing plate * (1) and one part (10) is extended towards the damping plate ( 3). Brake shoe according to claim 2, characterized in that the part (12) of the recess (5, 6) on the side of the damping plate (3) tapers conically towards the damping plate (3). Brake shoe according to claim 1, characterized in that the recesses ( 5, 6) in the carrier plate (1); friction lining (2) ^- tapers towards the damper - <sheet metal washer (3). I ' Brake shoe according to one of Claims 1 to 4, characterized in that the projections (9) are arranged around the entire circumference of said recess (7, 8). Brake shoe according to one of Claims 1 to 5, characterized in that the projections (9) extend perpendicularly from the damping plate (3). Brake shoe according to one of Claims 1 to 6, characterized in that the outer opening (14) of the recess (7, 8) in the support plate (1> of the friction lining (2) is I chamfered on the side of the damping plate (3). Brake shoe according to one of Claims 1 to 7, characterized in that the damping plate (3) is glued to the friction lining support plate (1). ·? 9. Brake jaw by one of the claims 1 to 8 in y- značuj úc and sa t ý m. that the recesses (5, 6, 7, 8) nia j ú many exterior outline. 10. Brake jaw by one of claims 1 until 8 v y - značuj úc and sa t ý m. that carrier plate (l) tre <71 e ho lining (2) a tlmi aca metal washer (3) are provided always at least two recesses ( 5, 6, 7 8) p circular outline 11. Brake what sorry by one of the claims 1 to 8 v y characterized in that the protrusions (9) consist of tongues (16) spaced at equal angular spacing from each other, wherein the tongues (16) extend from the circular openings (14) of the respective recess (7, 8) and extend into a circular or a polygonal recess (5, 6) of the friction lining support plate (1). Brake shoe according to claim 11, characterized in that the tongues (16) have a rectangular shape. 13. Brake shoe for disc brake, consisting of a friction lining support plate (1) symmetrical to a disc brake plane parallel and orthogonal to the axis of rotation of the disc brake, friction lining (2) and a damping plate arranged on the side of the support plate ( 1) facing away from the friction lining (2) and secured against the grip, characterized by: The friction lining support plate (1) and the damping plate (3) are also provided with through recesses (5, 6, 7) interlocking with one another and having a plan view of said recess (7), 8) at least two straight edges (15) have mutually opposite inclination to the radial axis (18) lying in the axis of symmetry of the bearing plate (1) of the friction disc (2) and straight edges (15) have tongues (16) extending towards the support plate of the lining (2) and extending into corresponding 6) a friction lining support plate (1) with a bearing which allows limited movement of the damping plates (3) in a direction parallel to the transverse and edges 14th The brake shoe of claim 13. characterized in that the inclination of the radial axis (18) is at an angle straight from 0 ° to the edges (15) towards the 15th A brake shoe according to claim 13 or 14, wherein said brake shoe; that the recesses (7, 8) have straight edges (15) parallel to each other, with the tongues (16) provided thereon, Brake shoe according to one of Claims 13 to 15, characterized in that the straight edges (15) of the recesses (7, 8) of the damping plate (3) converge outwardly with respect to each other in a radial direction. s A brake shoe according to claim 13, characterized in that; The recesses (7, 8) have three straight edges (15), the tongues (16) of which are triangular in the recesses (5, 6). » Brake shoe according to one of Claims 13 to 17, characterized in that the recesses (5, 6) in the bearing plate (1) of the friction lining (2) are circular and there is free movement between the lateral ends (17) of the tongues (17). 16) and recesses (5, 6) of the friction lining support plate (1).